Stretching is a waste of time in most cases!
The Globe and Mail wrote a nice piece about the merits of stretching.
Stretching may be helpful if a muscle is much tighter on one side of the body than the opposite side, or if you need extra range of motion for a specific sport.
You may also like these articles I wrote or contributed to:
Telegraph Athletics Weekly 220 Triathlon Vigour Magazine
Podcasts I was on:
Treating professional athletes and the general public since 1997.